/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.nio.channels;

import java.net.SocketAddress;

import java.nio.file.Path;

import java.security.AccessController;

import java.security.PrivilegedAction;

import java.util.Objects;

/**

 * An address for a Unix domain socket or server socket channel. These

 * addresses contain a String path name, which when bound to a channel,

 * have an associated file in the file-system with the same name.

 * <p>

 * file in the file-system.

 * <p>

 * Note, not all channel types support Unix domain addresses.

 *

 * @since 14

 */

public class UnixDomainSocketAddress extends SocketAddress {

    static final long serialVersionUID = 9829020419651288L;

    static {

        if (System.getSecurityManager() == null) {

            System.loadLibrary("nio");

        } else {

            AccessController.doPrivileged((PrivilegedAction<Void>) () -> {

                System.loadLibrary("nio");

                return null;

            });

        }

        init();

    }

    private final String path;

    /**

     * Create a named UnixDomainSocketAddress for the given path string.

     *

     * @param path the pathname to the socket.

     *

     * @throws NullPointerException if path is null

     */

    public UnixDomainSocketAddress(String path) {

        Objects.requireNonNull(path);

        this.path = path;

    }

    /**

     * Create a named UnixDomainSocketAddress for the given path.

     *

     * @param path the path to the socket.

     *

     * @throws NullPointerException if path is null

     */

    public UnixDomainSocketAddress(Path path) {

        Objects.requireNonNull(path);

        this.path = path.toString();

    }

    /**

     * Return this address's path.

     *

     * @return this address's path

     */

    public String getPath() {

        return path;

    }

    static native void init();

    /**

     * Returns a hashcode computed from this object's path string.

     */

    @Override

    public int hashCode() {

        return path.hashCode();

    }

    /**

     * Compares this address with another object.

     *

     * @return true if the path fields are equal

     */

    @Override

    public boolean equals(Object o) {

        if (! (o instanceof UnixDomainSocketAddress))

            return false;

        UnixDomainSocketAddress that = (UnixDomainSocketAddress)o;

        return this.path.equals(that.path);

    }

    @Override

    public String toString() {

        StringBuilder sb = new StringBuilder();

        sb.append("af_unix:");

        if (path != null)

            sb.append(path);

        return sb.toString();

    }

}